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C-peptide test is done to find out whether a person has type 1 or type 2 diabetes. The results of C-peptide test helps the doctor determine how much insulin to prescribe to the patient,it doesn’t help diagnose diabetes but helps treat it.


C-peptide test is based on the principle that the beta cells of the pancreas make insulin and during that process it also makes c-peptide. With the c-peptide test, the doctor can measure how much insulin is being made. The c-peptide test helps your doctor decide whether you need insulin or not.

Why is C-PEPTIDE TEST suggested?

C-peptide test is suggested to find out :

  • Whether one had type 1 or type 2 diabetes
  • How much insulin one needs to take if they have type 1 diabetes
  • It needs to start insulin when they have type 2 diabetes
  • If the pancreas has a tumor

How is C-PEPTIDE TEST performed?

C-peptide test is performed in the following manner:

  • A blood sample is collected from the vein of the forearm.
  • Sample sent to the lab to be analyzed.

           The results of the c-peptide test arrive within 24 hours.

What are the parameters measured in C-PEPTIDE TEST

C-peptide test measures the level of c-peptide in blood. The normal range of c-peptide is 0.5-2 ng/ml. High levels mean insulin resistance or a tumor. Low levels indicate diabetes.

Preparation before performing C-PEPTIDE TEST

[Preparations before c-peptide include:

  • Fasting for 8-10 hrs before the test.
  • Let the doctor know about any medications you are on.

Post-care after C-PEPTIDE TEST

There is no post care needed after the c-peptide test.

Sample types in C-PEPTIDE TEST

Sample types in the c-peptide test is:

  • 5 to 2 ml of blood


Side effects/risks of C-PEPTIDE TEST

There are no side effects of the c-peptide test.

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